GLACIER FRESH GFU03 Electric-Free Reverse Osmosis Water Filter 800 GPD | Non‑Electric, 3:1 Pure to Drain, 5-Stage Under Sink RO Water Filter System, Reduces PFAS, Lead & TDS, 0.0001μm RO Membrane

TankInside Design. GLACIER FRESH GFU03 internal tank reverse osmosis system features a water-powered structure, requiring no electricity with near-silent operation. This all-in-one design removes the need for an external tank and saves up to 70% of under-sink cabinet space, replacing bulky external storage tanks. It reduces electrical safety risks and fits most under-sink installations.

5-Stage Filtration. Under-sink Tankless reverse osmosis system meets NSF/ANSI 58, 372, and 401 standards, employing a precise multi-stage filtration system to effectively remove including PFOA, PFOS, chlorine, lead, fluoride and other heavy metals, as validated by independent testing. So every drop is clean, safe, and fresh-tasting, for a cleaner, better-tasting drinking experience.

800 GPD Fast Flow. This 800 GPD high-flow system provides purified water to meet water demands for large households. It features a built-in real-time water pressure gauge to help maintain stable system performance. Note: Actual flow rate varies based on incoming water pressure. A minimum inlet pressure of 40 PSI is recommended; lower pressure will reduce flow output.

3. 1 Pure-to-Drain Ratio: The GFU03 Tankless Reverse Osmosis System features an impressive 3:1 pure-to-waste water ratio—producing just one cup of wastewater for every three cups of purified water—far more efficient than systems with 1:1 or 1:2 ratios. This not only saves you money but also reduces water waste and supports more sustainable water use.

30 Minute Quick Installation. This undersink water filter system can be installed in just 30 minutes, half the time of traditional tank-style systems (2–4 hours). Includes all adapters and tool-free connectors. Note: This product requires drilling a 1/2"-1" diameter hole in the sink to prepare for faucet installation.